I was looking at the neww jegs and summit catologs testerday, u cant even touch a new late model supercharger for less than $4500, most are around $5000 and up. I have every bit of 10 grand in my engine . U can build a normally aspirated 500" engine w/ over 700 h.p. for less ??
You have to toss those catalogs away and start networking, going to swap meets and shows and meet the folks that can help you out with parts and advice.
On my 354 I bought three 6-71 cores for $20 each... Took my tools along and pulled them right from the diesels. Bought a BBC drive kit off if flea bay for $250-ish... Had a blower shop in Oregon do the conversion for $280.00 (Dean Blowers). Plus another $90.00 for a rear cover, gaskets and such.
$2500 in machine work, $800 Venolia pistons, $165 cam, NOS Cragar intake for $300...
Do your homework and you can save a bundle. If I had to buy out if those catalogs I'd be priced out of the hobby.